The vapour pressure of a solution of a non-volatile solute B in a solvent A is 95% of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is 0.3 times th

Question

The vapour pressure of a solution of a non-volatile solute B in a solvent A is 95% of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is 0.3 times the molecular weight of the solute, what is the weight ratio of solvent to solute?

TestHub · Accepted Answer

From Raoult’s law, P 1 ​ P 0 ​ − P ​ ​ = M B ​ W A ​ W B ​ M A ​ ​ or, 19 1 ​ = W A ​ W B ​ ​ × 0.3 Therefore, W B ​ W A ​ ​ = 0.3 × 19 = 5.7 .

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JEE Main + Advanced (1 year 12th class)